/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
 
* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

grammar Json;

// Json Number

NUMBER: (MINUS)? INT (FRAC)? (EXP)?;
DEC_PT: '.'; 
fragment DIGIT1_9 : [1-9] ;
fragment DIGIT : [0-9] ;
E: 'e' | 'E';
EXP: E (MINUS | PLUS)? DIGIT+;
FRAC: DEC_PT DIGIT+;
INT: ZERO | DIGIT1_9 (DIGIT+)?;
MINUS: '-';
PLUS: '+';
ZERO: '0';

// Json String

STRING: '"' (CHAR)* '"';
fragment CHAR: UNESCAPED | ESCAPED;
fragment UNESCAPED : (' ' .. '!') | ('#' .. '[') | (']' .. '~');
fragment ESCAPED: '\\' ('"' | '\\' | '/' | 'b' | 'f' | 'n' | 'r' | 't');